Yokoyama Chie

The School nurse at the school Yuuichi attends. In addition to her daily health care duties, she takes on visitors at the school infirmary or does home visits to provide counseling to parents and students.

During her counseling, she noticed that there are mothers who have incestuous desires as well as boys who developed interest in sex earlier than others. As a result she founded the "mama club".

She typically only manages the administration of the club but from time to time also engages in "club activities".